carter



(No Model) B. JA N & G W CARTER.

PULLEY BLOGK.

No. 275,916. Patented Apr. 17,1883.

TNITED STATES PATENT @FFICE.

BYRON JACKSON, OF SAN FRANCISCO, AND GEORGE \V. T. CARTER, OF BYRON, CAL. SAID CARTER ASSIGNOR TO SAID JACKSON.

PU LLEY-BLQCK.

SPECIFICATION forming part of Letters Patent No. 275,916, dated April 1'7, 1883.

Application filed January 2, 1883.

(N0 model.)

To all whom it may concern Be it known that we, BYRON JACKSON, of the city and county of San Francisco, and GEO. \V. T. CARTER, of Byron, countyot' Contra Costa, and State of California, have invented an Improved Pulley-Block; and we hereby declare the following to be a full, clear, and exact description thereof.

Our invention relates to certain improvements in pulley-blocks; and it consists of a skeleton two-part iron shell, which is bolted together at the top and bottom and has chambers formed in each side, into which wooden boxes are fitted. Thepulley-pin is formed with or fixed into the pulley, so as to turn in the wooden boxes. The top of the shell or case has a vertical hole opening at the bottom into an enlarged chamber, and thehead of the belt or book by which the block is suspended fits loosely in this chamber, the shank passing out loosely through the hole.

Referring to the accompanying drawings for a. more complete explanation of ourinvention, Figure 1 is a view of our pulley-block. is an inside view of one-half the shell, showing the box and the manner of suspending the block. Fig. 3 is a transverse section taken through the box, chamber, and retaining-plate. Fig. 4 is a detail of construction.

A A are the two halves of the shell, within which the sheave B is inclosed and journaled. The sheave has a deeply-grooved rim to protect the rope from abrasion, and the shell is made roomy above and below, so that a rope may be readily passed through. In the two halves A of the shell are formed chambers C, of sufficient size to receive the wooden blocks or boxes D, which fittherein. These blocks have holes made in them to receive the ends of the sheave pin or axle, which is firmly fixed in the sheave, or may be cast with it. Projections or lips 0, upon each side of thechambers C, serve as guides for the plates F, which are perforated to allow the pins to pass through. These plates are free to slide vertically, and as the boxes become worn down they slide, so as to accommodate themselves to the position of the sheave-pin while holding the boxes in place. These wooden boxes absorb sufficient oil to run for alongtime withoutattention, and they Fig.2-

wear very slowly. When worn down upon one side they may be reversed in the chambers, and will then last as much longer. When worn out it is only necessary to bore a hole in a proper-sized block to fit the chamber and replace it to make the pulley as good as ever. There is no danger of cutting out the boxes and ruining the whole pulley by any lack of attention.

To preveutthe rope beeomi ug chafed against the sides of the block on account of its not hanging true, we term a chamber, G, in the upper part of the block, with a vertical passage, H, extending upward from it. The shank I of the suspending hook or bolt passes loosely down through this opening, and has ahead, J, which fits loosely within the chamber. This allows the pulley to adjust itself from side to side to accommodate itself to the movements of the rope, which is thus relieved from chafing.

Having thus described our invention, what we claim asnew, and desire to secure byLetters Patent, is

1. In a pulley-block consisting of the two half-shells A, bolted together, and havingthe sheave B journaled to turn within them, the chamber G and passage H, within which the head and shank of the suspending hook or bolt are loosely confined,substantially as herein described.

2. The iron shellA ot' a pulley-block, having the chambers C formed in the sides, and the perforated wooden boxes D, fitting said chambers, in combination with the sheave B, having an axle integral with the sheave or pin, substantially as herein described.

The sectional iron shell A of a pulleyblock, with the chambers C, formed in the sides, the contained wooden boxes D, perforated to receive the ends of the sheave-pin, and the sliding plate F, fitting overthe boxes and aljustable in guides, substantially as herein described.

In wituess whereof we hereunto set our hands.

BYRON JACKSON. G. W. T. CARTER. Witnesses:- L. H. NoURsE,

WM. F. BOOTH. 

